Development of the Aorta Prof Abdulameer Al Nuaimi abdulameerhyahoocom Development of the aorta Development of the aorta takes place during the third week of gestation ID: 617939
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Slide1
E-mail: a.al-nuaimi@sheffield.ac.uk
Development of the Aorta
Prof. Abdulameer Al-Nuaimi
abdulameerh@yahoo.comSlide2
Development of the aortaDevelopment of the aorta takes place during the third week of gestation
. It is a complex process associated with the formation of the endocardial tube (heart tube) at day 21. blood islands appear bilaterally in the splanchnic mesoderm parallel
and close to the midline of the embryo forming a pair of longitudinal vessels, the Dorsal Aortae.
The
two ventral aortae fuse to form the
aortic
sac which is continuous with truncus arteriosus
.
The
dorsal aortae fuse to form the midline descending aorta
.
Six
paired aortic arches
, the so-called
branchial arch arteries
, develop between the ventral
(aortic sac) and
dorsal aortae. In addition, the dorsal aorta gives off several intersegmental arteriesSlide3
Establishment of
Cardiogenic
field
(
Langman’s
Medical Embryology)
YolkSacSlide4
(
Langman’s
Medical Embryology)Slide5Slide6
Aortic Sac
Dorsal Aorta
Heart
Intersegmental branches
3
rd
branchial arch
Gives rise to
internal
Carotid artery
Dorsal Aorta
Lt
Rt
truncus
arteriosus
the midline descending aortaSlide7
Truncus
ArteriosusSlide8
Internal carotid
artery
Common Carotid
artery
Rt
subclavvian
art
Aortic sac
Lt
Rt
Brachiocephalic
Trunk
Ascending aorta
The aortic sac gives rise to Ascending aorta and brachiocephalic trunk
Dorsal aorta
Ductus
arteriosus
Right pulmonary artery
Internal carotid art
Ventral Aorta
Pulmonary Trunk
Common carotid artSlide9
The vessels derived from each arch are as follows:
1st pair: contributes to formation of the maxillary
and external carotid arteries.2nd pair: contributes to formation of the
stapedial arteries of the ear 3rd
aortic
arch constitutes the commencement of the
internal carotid artery and common carotid
arteries,
therefore
it is named as the carotid arch
.
Internal carotid artery
Common carotid artery
Rt
Lt
External carotid artSlide10
4
th arch: The left arch forms the segment of normal left aortic arch between the left common carotid and subclavian arteries.
The right fourth arch forms the proximal right subclavian artery. The distal right subclavian artery is derived from a portion of the
right dorsal aorta and the right seventh intersegmental artery. The rest of the right aorta degenerates
5
th
arch
degenerate
vessels
Intersegmental
arteries
Lt
Rt
3
4
5
4
4
Dorsal aorta
Degenerated
Rt
dorsal aorta
Aortic arch
Right
subclavian
arterySlide11
6
th pair: The left arch contributes to the formation of the main and left pulmonary arteries and
ductus arteriosus; this duct obliterates a few days after birth. The right sixth arch contributes to formation of the right pulmonary artery.
Rt
Lt
Dorsal Aorta
Ventral AortaSlide12
the seventh intersegmental arteries enlarge
and migrate cranialy to form the distal subclavian arteries.
The left subclavian artery is derived entirely from the left seventh intersegmental artery, whereas the portions of the right are derived from the right fourth arch and the right dorsal aorta.
Right subclavian
artery
Right
Left
Vertebral Artery is formed
b
y seven intersegmental
arteries
Vertebral Artery
Posterior intercostal arteries
Internal thoracic artery
3
4
5
Connection of int.
carot
with dorsal aorta
degenerate
Internal carotid artery
Subclavian
arterySlide13
Thank You